urlwatch: 2.9 -> 2.11

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/urlwatch/versions.

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/gpf4j5mmd5zbz0rqj39d57d38f6311pn-urlwatch-2.11/bin/.urlwatch-wrapped had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/gpf4j5mmd5zbz0rqj39d57d38f6311pn-urlwatch-2.11/bin/urlwatch had a zero exit code or showed the expected version
- 0 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 2.11 with grep in /nix/store/gpf4j5mmd5zbz0rqj39d57d38f6311pn-urlwatch-2.11
- directory tree listing: https://gist.github.com/f36eb5277839d9ca3d15995cec7cc592
- du listing: https://gist.github.com/47f738cad88e3941c1c0f149f8aa4fc7